We are all guilty of this (assumption, we are almost definitely not), leaving cups. We hate the dirty cups when we find them and we say things like:
"FOR GOD'S SAKE WHY DO PEOPLE DO THIS? IT'S NOT HARD JUST TAKE THE CUP DOWNSTAIRS INSTEAD OF LEAVING IT TO GO FUCKING MOULDY! IT IS SO DISGUSTING!", et cetera whilst we secretly wonder whether the cup is ours, or most certainly know
but really people (including me) why do you do it?
Because we secretly like the excitement of having germs growing in our rooms that's why!
In this clean, clean world we need the little adrenaline rush that knowing things that could kill (harm) us are growing near at night.
Because we love the SPORES!
well that's one theory anyway.
I put it to you psychologists, why do we never learn?
Why do we repeatedly leave cups around our houses?